CN109772223B - Fluid mixer - Google Patents
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- CN109772223B CN109772223B CN201910187983.7A CN201910187983A CN109772223B CN 109772223 B CN109772223 B CN 109772223B CN 201910187983 A CN201910187983 A CN 201910187983A CN 109772223 B CN109772223 B CN 109772223B
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Abstract
The invention belongs to the field of microfluid driving and control, and particularly relates to a fluid mixer. The upper cover and the lower cover are arranged on the upper side and the lower side of the main body, the upper cover is provided with an upper inlet and outlet valve, and the main body is provided with a lower inlet and outlet valve; two drivers are pressed in the main body driving cavity through an upper cover boss, a sealing ring and a gasket, and the drivers are pressed in the mixing cavities of the main body through a lower cover boss and a sealing ring; the driver in the driving cavity, the sealing ring and the upper cover form an upper driving cavity, and the driving cavity and the main body form a lower driving cavity, and the upper driving cavity and the lower driving cavity are respectively connected in series to form an upper driving unit and a lower driving unit; the driver and the sealing ring in the mixing cavity and the main body form a mixing cavity, and the mixing cavities are connected in series to form a mixing unit; the upper and lower driving units are connected in parallel and then connected in series with the mixing unit; the driving frequency of the drivers in the upper and lower driving units is the same and not more than one half of the excitation frequency of the drivers in the mixing unit, the upper and lower driving units alternately or simultaneously discharge fluid, and the fluid discharged by the upper and lower driving units enters the mixing unit to be actively mixed in multiple stages and then is discharged through the discharge hole.
Description
Technical Field
The invention belongs to the field of fluid driving and control, and particularly relates to a fluid mixer.
Background
The fluid mixer is an indispensable key flow control device in the fields of biochemistry, medical treatment, food, environmental monitoring and the like. The initial fluid mixers are mostly passive, the flow field distribution is changed by arranging a special geometric structure in a fluid motion path and the mixing is realized by combining the free diffusion of fluid molecules, the structure is simple, the manufacture and the integration are easy, the performance is stable, and the defects are that the mixing flow is longer, the speed is slow and the mixing process is uncontrollable; recently, various types of active fluid mixers have been proposed in succession to promote fluid mixing by external power, and the existing active fluid mixers mainly include two types, i.e., electromagnetic type and piezoelectric type, according to the power source, wherein the piezoelectric fluid mixer has a simple structure, a small volume, and a good mixing effect and a good process controllability. The existing piezoelectric type active mixer basically uses a single piezoelectric vibrator as an energy converter to synchronously realize the dual functions of fluid pumping and mixing, the fluid pumping energy is limited, and the existing piezoelectric type active mixer cannot be used for occasions with high fluid viscosity, large pipeline flow resistance or large mixed fluid conveying capacity; in addition, the conventional piezoelectric fluid mixer adopts the same transducer to synchronously drive two fluids with different viscosities, namely the fluids are simultaneously sucked through two inlets of the same cavity, so that the pumping quantities of the two fluids cannot be accurately controlled. Obviously, the driving capability, mixing effect and mixing ratio precision of the piezoelectric fluid mixer are all to be further improved.
Disclosure of Invention
In order to improve the output performance of the piezoelectric pump, the invention provides a fluid mixer, and the embodiment of the invention is as follows: the invention relates to a fluid mixer which is composed of an upper cover, a lower cover, a main body, a one-way valve, a driver, a sealing ring and a gasket. The upper cover is provided with an upper inflow hole, an upper cover round table with an upper outflow hole and at least two upper cover bosses, the right-most upper cover boss is provided with an upper inlet cavity and an upper outlet cavity, and other upper cover bosses are provided with upper inlet cavities and upper outlets; the upper inlet cavity at the leftmost side is communicated with the upper inlet hole, the upper outlet cavity is communicated with the upper outlet hole, and the other upper inlet cavities are communicated with the upper outlets on the adjacent upper cover bosses; the main body is provided with a lower inflow hole, a lower outflow hole, an outflow hole, drive cavities with the same number as the bosses of the upper cover, a main body circular cavity communicated with the communication hole and at least two mixing cavities, and the side walls of the drive cavities and the mixing cavities are provided with wiring grooves; the bottom wall of the rightmost driving cavity is provided with a lower inlet cavity and a lower outlet cavity, the bottom walls of other driving cavities are provided with a lower inlet cavity and a lower outlet, and the top wall of the mixing cavity is provided with a mixing cavity inlet and a mixing cavity outlet; the lower inlet cavity at the leftmost side is communicated with the lower inflow hole, and the other lower inlet cavities are communicated with the lower outlets on the adjacent driving cavities; the communicating hole is communicated with the lower outlet cavity through the lower outflow hole, and the communicating hole is communicated with the inlet of the rightmost mixed cavity; the outlet of the mixing cavity at the leftmost side is communicated with the outflow hole, and the outlets of the other mixing cavities are communicated with the inlets of the mixing cavities adjacent to the outlets of the mixing cavities; the upper cover and the lower cover are arranged on the upper side and the lower side of the main body through screws, an upper inlet and an upper outlet valve are respectively formed by an upper inlet cavity and a lower outlet cavity of the upper cover and a one-way valve arranged in the upper inlet and the lower outlet cavity, a lower inlet valve and a lower outlet valve are respectively formed by a lower inlet cavity and a one-way valve arranged in the lower inlet cavity of the main body and the one-way valve arranged in the lower inlet cavity, the one-way valve is a disk valve and is formed by bonding a valve plate and a valve seat, the valve plate is formed by a cover plate, a ring plate and at least three spiral plates for connecting the cover plate and the ring; the upper cover round table is arranged in the round cavity of the main body, the upper outflow hole of the upper cover is communicated with the lower outflow hole and the inlet of the mixing cavity on the main body through the communicating hole of the main body, two drivers are pressed in each driving cavity of the main body through an upper cover boss, a sealing ring and a gasket, the drivers are pressed in each mixing cavity of the main body through a lower cover boss and a sealing ring, the gasket is positioned between the two drivers, and the sealing ring is positioned between the drivers and the upper cover, the main body or the lower cover; the driver is formed by bonding a substrate and a piezoelectric sheet, the thickness of the substrate is equal to that of the piezoelectric sheet, and the substrate and the piezoelectric sheet are made of brass and PZT4 respectively; the driver and the sealing ring in the driving cavity and the upper cover form an upper driving cavity, and the upper driving cavity and the main body form a lower driving cavity; the driver and the sealing ring in the mixing cavity and the main body form a mixing cavity, and the mixing cavities are connected in series to form a mixing unit; the upper and lower driving units are connected in parallel and then connected in series with the mixing unit.
Taking a mixer with two upper driving cavities, two lower driving cavities and two mixing cavities as an example, from left to right, the upper inlet valves are sequentially defined as an upper inlet valve I and an upper outlet valve II, the lower inlet valves are sequentially defined as a lower inlet valve I and a lower inlet valve II, the upper driving cavities are sequentially defined as an upper driving cavity I and a lower driving cavity II, and the lower driving cavities are sequentially defined as a lower driving cavity I and a lower driving cavity II; from right to left, the mixing chambers are defined as mixing chambers one and two in sequence.
In the invention, the driving frequencies of the drivers in the upper and lower driving units are the same and are not more than one half of the excitation frequency of the drivers in the mixing unit.
In the present invention, the upper and lower driving units can alternately discharge fluid, and if the upper driving unit discharges fluid in the upper half cycle, the lower driving unit discharges fluid in the lower half cycle, specifically: the deformation directions of the drivers in the two upper driving cavities adjacent to the left and the right and the two lower driving cavities adjacent to the left and the right are respectively opposite, and the deformation directions of the drivers in the upper and the lower driving units opposite to each other are the same; in the first half period, the volumes of the upper driving cavity I and the lower driving cavity II are reduced, the volumes of the upper driving cavity II and the lower driving cavity I are increased, the upper inlet valve I, the upper outlet valve and the lower inlet valve II are closed, the upper inlet valve II, the lower inlet valve I and the lower outlet valve are opened, the lower driving unit sucks fluid from the lower inlet hole and discharges the fluid from the lower outlet valve, and the fluid in the upper driving cavity I in the upper driving unit enters the upper driving cavity II and is not output outwards; in the lower half period, the volumes of the upper driving cavity I and the lower driving cavity II are increased, the volumes of the upper driving cavity II and the lower driving cavity I are reduced, the upper inlet valve I, the upper outlet valve and the lower inlet valve II are opened, the upper inlet valve II, the lower inlet valve I and the lower outlet valve are closed, the upper driving unit sucks fluid from the upper inlet hole and discharges the fluid from the upper outlet valve, and the fluid in the lower driving cavity I in the lower driving unit enters the lower driving cavity II and is not output outwards.
In the present invention, the upper and lower driving units can discharge fluid at the same time, and if the upper and lower driving units discharge fluid in the upper half cycle, there is no discharge fluid in the lower half cycle, specifically: the deformation directions of the drivers in the two upper driving cavities adjacent to the left and the right and the two lower driving cavities adjacent to the left and the right are respectively opposite, and the deformation directions of the drivers in the upper and the lower driving units opposite to each other are opposite; in the first half period, the volume of the upper driving cavity I and the lower driving cavity II is increased, the volume of the upper driving cavity II and the lower driving cavity II is reduced, the upper inlet valve I and the lower inlet valve I are opened, the upper inlet valve II and the lower inlet valve II are closed, the upper driving unit sucks fluid from the upper inlet hole and discharges the fluid from the upper outlet valve, and the lower driving unit sucks fluid from the lower inlet hole and discharges the fluid from the lower outlet valve; in the lower half period, the volume of the upper driving cavity I and the volume of the lower driving cavity II are reduced, the volume of the upper driving cavity II and the lower driving cavity II are increased, the fluid in the upper driving cavity I in the upper driving unit enters the upper driving cavity II and has no fluid output to the outside, and the fluid in the lower driving cavity I in the lower driving unit enters the lower driving cavity II and has no fluid output to the outside.
The fluid discharged by the upper and lower driving units enters the mixing unit to be actively mixed in multiple stages and then is discharged through the discharge hole; when the driving voltage values of the drivers in the upper and lower driving units are the same, the fluid mixing ratio is adjusted through the flow area of the upper and lower inflow holes; when the flow areas of the upper inflow hole and the lower inflow hole are the same, the mixing ratio of the two fluids is adjusted by the driving voltage of the driver in the upper driving unit and the lower driving unit, and the flow rate and the pressure of the fluid output by the upper driving unit and the lower driving unit can be adjusted by the driving voltage U of the driver0Adjusting, when the water liquid is mixed:
in the formula: etaq、ηpThe flow and pressure correction coefficients related to system parameters are respectively, R, H are respectively the radius and height of the drive cavity, H is not less than the deformation of the center point of the driver under the action of the maximum input voltage when P is 0, H ispIs the thickness of the piezoelectric plate, f is the excitation frequency, U0For the drive voltage, N is the number of drivers in a drive unit, β0Is the bulk modulus of the fluid.
The characteristics and advantages are as follows: through synchronous driving and multistage mixing of multiple cavities, the fluid conveying capacity is strong, the mixing effect is good, and the device is suitable for continuous mixing and distribution of high-viscosity fluid; the two driving units are adopted to suck different fluids, the mixing proportion is easy to control through driving voltage or flow area, and the proportioning precision is high.
Drawings
FIG. 1 is a schematic sectional view of a mixer according to a preferred embodiment of the present invention;
FIG. 2 is a diagram showing the deformation of the transducer and the open/close state of the butterfly valve when the upper and lower driving units alternately suck and alternately discharge the fluid;
FIG. 3 shows the deformation of the transducer and the open/close state of the butterfly valve when the upper and lower driving units simultaneously suck and discharge the fluid;
FIG. 4 is a schematic structural view of the upper cover in a preferred embodiment of the present invention;
FIG. 5 is a schematic structural view of a main body according to a preferred embodiment of the present invention;
FIG. 6 is a top view of FIG. 5;
FIG. 7 is a schematic illustration of the construction of a butterfly valve in accordance with a preferred embodiment of the invention;
FIG. 8 is a schematic view of the structure of the valve plate according to a preferred embodiment of the present invention;
fig. 9 is a sectional view taken along line B-B of fig. 8.
Detailed Description
A fluid mixer of the present invention is composed of an upper cover a, a main body b, a lower cover c, a check valve v, an actuator d, a packing e, and a packing e 1. The upper cover a is provided with an upper inflow hole a1, an upper cover round platform a7 with an upper outflow hole a2 and at least two upper cover bosses a3, the rightmost upper cover boss a3 is provided with an upper inlet cavity a4 and an upper outlet cavity a5, and the other upper cover bosses a3 are provided with upper inlet cavities a4 and upper outlets a 6; the leftmost upper inlet cavity a4 is communicated with the upper inlet hole a1, the upper outlet cavity a5 is communicated with the upper outlet hole a2, and the rest upper inlet cavities a4 are communicated with the upper outlets a6 on the adjacent upper cover bosses a 3; the main body b is provided with a lower inflow hole b1, a lower outflow hole b2, an outflow hole b12, driving cavities b3 with the same number as the upper cover boss a3, a main body round cavity b7 communicated with the communication hole b8 and at least two mixing cavities b9, and the side walls of the driving cavity b3 and the mixing cavity b9 are provided with wiring grooves b 13; a lower inlet cavity b4 and a lower outlet cavity b5 are arranged on the bottom wall of the rightmost driving cavity b3, a lower inlet cavity b4 and a lower outlet b6 are arranged on the bottom wall of the other driving cavity b3, and a mixing cavity inlet b10 and a mixing cavity outlet b11 are arranged on the top wall of the mixing cavity b 9; the leftmost lower inlet chamber b4 communicates with the lower intake hole b1, and the remaining lower inlet chamber b4 communicates with the lower outlet b6 on its adjacent drive chamber b 3; the communication hole b8 is communicated with the lower outlet cavity b5 through the lower outflow hole b2, and the communication hole b8 is communicated with the rightmost mixed cavity inlet b 10; the leftmost mixing cavity outlet b11 is communicated with the outflow hole b12, and the rest mixing cavity outlets b11 are communicated with the mixing cavity inlets b10 of the adjacent mixing cavity b 9; the upper cover a and the lower cover c are arranged on the upper side and the lower side of the main body b through screws, an upper inlet cavity a4 and an upper outlet cavity a5 of the upper cover a and a one-way valve v arranged in the upper inlet cavity and the upper outlet cavity respectively form an upper inlet valve svn and an upper outlet valve so, a lower inlet cavity b4 and a lower outlet cavity b5 of the main body b and the one-way valve v arranged in the lower inlet cavity and the upper outlet cavity respectively form a lower inlet valve xvn and a lower outlet valve xo, the one-way valve v is a disk valve and is formed by bonding a valve plate i and a valve seat j, the valve plate i is formed by a cover plate i1, a ring plate i3 and at least three spiral sheets 387i 5 connecting the cover plate i1 and the ring plate i3, the spiral sheet i2 before bonding the valve plate i is pre-bent towards one side of the ring plate i3, and the; the upper cover round table a7 is arranged in the main body round cavity b7 and the upper outflow hole a2 of the upper cover a is communicated with the lower outflow hole b2 of the main body b and the mixing cavity inlet b10 through the communication hole b8 of the main body b; two drivers d are pressed in each driving cavity b3 of the main body b through an upper cover boss a3, a sealing ring e and a gasket e1, the drivers d are pressed in each mixing cavity b9 of the main body b through a lower cover boss c1 and a sealing ring e, a gasket e1 is positioned between the two drivers d, and the sealing ring e is positioned between the drivers d and the upper cover a, the main body b or the lower cover c; the driver d and the sealing ring e in the driving cavity b3 and the upper cover a form an upper driving cavity scn, the lower driving cavity xcn forms a lower driving cavity b, the upper driving cavities scn are connected in series to form an upper driving unit I, and the lower driving cavities xcn are connected in series to form a lower driving unit II; a driver d and a sealing ring e in the mixing cavity b9 form a mixing cavity hcn with the main body b, and the mixing cavities hcn are connected in series to form a mixing unit III; the upper driving unit I and the lower driving unit II are connected in parallel and then connected in series with the mixing unit III; the driver d is formed by bonding a substrate d1 and a piezoelectric sheet d2, the thicknesses of the substrate d1 and the piezoelectric sheet d2 are equal, and the materials of the substrate d1 and the piezoelectric sheet d2 are brass and PZT4 respectively.
In the invention, n in svn, xvn, scn and xcn represents a serial number from left to right, n in hcn represents a serial number from right to left, and n is 1, 2, 3.; taking as an example a mixer with two upper drive chambers scn, two lower drive chambers xcn and two mixing chambers hcn, from left to right, the upper inlet valves svn are defined in turn as upper inlet valves one sv1 and two sv2, the lower inlet valves xvn are defined in turn as lower inlet valves one xv1 and two xv2, the upper drive chambers scn are defined in turn as upper drive chambers one sc1 and two sc2, and the lower drive chambers xcn are defined in turn as lower drive chambers one xc1 and two xc 2; from right to left, the mixing chamber hcn is defined as mixing chambers one hc1 and two hc2 in that order.
In the invention, the driving frequency of the driver d in the upper driving unit I and the lower driving unit II is the same and is not more than half of the excitation frequency of the driver d in the mixing unit III.
In the present invention, the upper driving unit I and the lower driving unit II alternately discharge fluid, and if the upper driving unit I discharges fluid in the upper half cycle, the lower driving unit II discharges fluid in the lower half cycle, specifically: the deformation directions of the drivers d in the two upper driving cavities scn adjacent to the left and right and the two lower driving cavities xcn adjacent to the left and right are respectively opposite, and the deformation directions of the drivers d in the upper driving unit I and the lower driving unit II opposite to each other are the same; in the upper half period, the volumes of the upper driving cavity one sc1 and the lower driving cavity two xc2 are reduced, the volumes of the upper driving cavity two sc2 and the lower driving cavity one xc1 are increased, the upper inlet valve one sv1, the upper outlet valve so and the lower inlet valve two xv2 are closed, the upper inlet valve two sv2, the lower inlet valve one xv1 and the lower outlet valve xo are opened, the lower driving unit II sucks fluid from the lower inlet hole b1 and discharges the fluid from the lower outlet valve xo, and the fluid in the upper driving cavity one sc1 in the upper driving unit I enters the upper driving cavity two sc2 and has no fluid output to the outside; in the next half period, the volumes of the upper drive chamber one sc1 and the lower drive chamber two xc2 are increased, the volumes of the upper drive chamber two sc2 and the lower drive chamber one xc1 are decreased, the upper inlet valve one sv1, the upper outlet valve so and the lower inlet valve two xv2 are opened, the upper inlet valve two sv2, the lower inlet valve one xv1 and the lower outlet valve xo are closed, the upper drive unit I sucks fluid from the upper inlet hole a1 and discharges the fluid from the upper outlet valve so that the fluid in the lower drive chamber one xc1 in the lower drive unit II enters the lower drive chamber two xc2 and has no fluid output to the outside.
In the present invention, the upper driving unit I and the lower driving unit II may discharge fluid at the same time, and if the upper driving unit I and the lower driving unit II both discharge fluid in the upper half period, there is no discharge fluid in the lower half period, specifically: the deformation directions of the drivers d in the two upper driving cavities scn adjacent to the left and right and the two lower driving cavities xcn adjacent to the left and right are respectively opposite, and the deformation directions of the drivers d in the upper driving unit I and the lower driving unit II opposite to each other are opposite; in the upper half cycle, the volumes of the upper driving chamber one sc1 and the lower driving chamber one xc1 are increased, the volumes of the upper driving chamber two sc2 and the lower driving chamber two xc2 are decreased, the upper inlet valve one sv1, the lower inlet valve one xv1, the upper outlet valve so and the lower outlet valve xo are opened, the upper inlet valve two sv2 and the lower inlet valve two xv2 are closed, the upper driving unit I sucks the fluid from the upper inlet hole a1 and discharges the fluid from the upper outlet valve so, and the lower driving unit II sucks the fluid from the lower inlet hole b1 and discharges the fluid from the lower outlet valve xo; in the lower half period, the volumes of the upper drive cavity one sc1 and the lower drive cavity one xc1 are reduced, the volumes of the upper drive cavity two sc2 and the lower drive cavity two xc2 are increased, fluid in the upper drive cavity one sc1 in the upper drive unit 1 enters the upper drive cavity two sc2 and has no fluid output to the outside, and fluid in the lower drive cavity one xc1 in the lower drive unit II enters the lower drive cavity two xc2 and has no fluid output to the outside.
The fluids discharged by the upper driving unit I and the lower driving unit II enter the mixing unit III to be actively mixed in a multi-stage mode, and the actively mixed fluids are discharged through the outflow hole b 12; when the driving voltage values of the drivers d in the upper driving unit I and the lower driving unit II are the same, the fluid mixing ratio is adjusted through the flow areas of the upper inflow hole a1 and the lower inflow hole b 1; the flow areas of the upper inflow hole a1 and the lower inflow hole b1 are the same, the mixing ratio of the two fluids is adjusted by the driving voltage of the driver d in the upper driving unit I and the lower driving unit II, and the flow rate and the pressure of the fluid output by the upper driving unit I and the lower driving unit II can be adjusted by the driving voltage U of the driver d0Adjusting, when the water liquid is mixed:
in the formula: etaq、ηpThe flow and pressure correction coefficients related to system parameters are respectively, R, H are respectively the radius and height of the driving cavity, H is not less than the deformation of the central point of the driver d under the action of the maximum input voltage when P is 0, H ispThickness of the piezoelectric sheet d2, f excitation frequency, U0For the driving voltage, N is the number of drivers d in the upper or lower drive unit I or II, β0Is the bulk modulus of the fluid.
Claims (1)
1. A fluid mixer, characterized by: the upper cover is provided with an upper inflow hole, an upper cover round table with an upper outflow hole and at least two upper cover bosses, the right-most upper cover boss is provided with an upper inlet cavity and an upper outlet cavity, and other upper cover bosses are provided with upper inlet cavities and upper outlets; the leftmost upper inlet cavity is communicated with the upper inlet hole, the rightmost upper outlet cavity is communicated with the upper outlet hole, and the rest upper inlet cavities are communicated with the upper outlets of the adjacent upper cover bosses; the main body is provided with a lower inflow hole, a lower outflow hole, an outflow hole, drive cavities with the same number as the bosses of the upper cover, a main body circular cavity communicated with the communication hole and at least two mixing cavities; the bottom wall of the rightmost driving cavity is provided with a lower inlet cavity and a lower outlet cavity, the bottom walls of other driving cavities are provided with a lower inlet cavity and a lower outlet, and the top wall of the mixing cavity is provided with a mixing cavity inlet and a mixing cavity outlet; the leftmost lower inlet cavity is communicated with the lower inflow hole, and the other lower inlet cavities are communicated with the lower outlets on the adjacent driving cavities; the communicating hole is communicated with the lower outlet cavity through the lower outflow hole, and the communicating hole is communicated with the inlet of the rightmost mixed cavity; the outlet of the left mixing cavity is communicated with the outflow hole, and the outlets of the other mixing cavities are communicated with the inlets of the mixing cavities adjacent to the mixing cavities; the upper cover and the lower cover are arranged on the upper side and the lower side of the main body, an upper inlet cavity and an upper outlet cavity of the upper cover and the one-way valve arranged in the upper inlet cavity and the upper outlet cavity respectively form an upper inlet valve and an upper outlet valve, and a lower inlet cavity of the main body and the one-way valve arranged in the lower inlet cavity and the lower outlet cavity respectively form a lower inlet valve and a lower; the upper cover round table is arranged in the main body round cavity, the upper outflow hole of the upper cover is communicated with the lower outflow hole and the mixed cavity inlet on the main body through the communication hole of the main body, two drivers are pressed in each driving cavity of the main body through an upper cover boss, a sealing ring and a gasket, the drivers are pressed in each mixed cavity of the main body through a lower cover boss and a sealing ring, and each driver is formed by bonding a substrate and a piezoelectric sheet; the driver and the sealing ring in the driving cavity and the upper cover form an upper driving cavity, and the upper driving cavity and the main body form a lower driving cavity; the driver and the sealing ring in the mixing cavity and the main body form a mixing cavity, and the mixing cavities are connected in series to form a mixing unit; the upper and lower driving units are connected in parallel and then connected in series with the mixing unit; the driving frequency of the drivers in the upper and lower driving units is the same and not more than one half of the excitation frequency of the drivers in the mixing unit, and the upper and lower driving units can alternately or simultaneously discharge the fluid; the fluid discharged by the upper and lower driving units enters the mixing unit to be actively mixed in multiple stages and then is discharged through the discharge hole; the fluid mixing proportion is adjusted by the same driving voltage value of the drivers in the upper and lower driving units through the flow area of the upper and lower inflow holes, and the mixing proportion of the two fluids is adjusted by the same driving voltage value of the drivers in the upper and lower driving units through the same flow area of the upper and lower inflow holes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910187983.7A CN109772223B (en) | 2019-03-01 | 2019-03-01 | Fluid mixer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910187983.7A CN109772223B (en) | 2019-03-01 | 2019-03-01 | Fluid mixer |
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| CN109772223A CN109772223A (en) | 2019-05-21 |
| CN109772223B true CN109772223B (en) | 2021-02-26 |
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2019
- 2019-03-01 CN CN201910187983.7A patent/CN109772223B/en active Active
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| CN109772223A (en) | 2019-05-21 |
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